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Inventories, Contracts in Progress and Vehicle Floor Plan Payable (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Inventories, Contracts in Progress And Vehicle Floor Plan Payable [Abstract]    
Raw materials $ 45,382 $ 35,119
Work-in-process 10,402 10,775
Finished goods 64,061 70,602
Contracts in Progress 777 4,338
Inventories and contracts in progress $ 120,622 $ 120,834